Some DNS do not resolve gtk-rs.org

[mkaput]

Hello,

I have strange issues with gtk-rs.org address. On some ISPs in Poland, their DNS do not resolve this domain, resulting in site being unreachable. The workaround is to hardcode DNS server addresses to CloudFlare or Google DNS.

Has this problem occurred earlier, or am I a rare case?

[GuillaumeGomez]

First time we heard about it. I don't really know what to say about it...

[nirvdrum]

I looked into this a bit because I also couldn't access the site. It looks like DNSSEC for the gtk-rs.org domain isn't correct. I'm hardly a DNSSEC expert, but my understanding is you'd need to be able to sign/verify the entire resolution chain and github.io doesn't use DNSSEC. The A records you have for gtk-rs.github.io look very suspicious as well, as the only thing that should appear are entries from the gtk-rs.org domain:

$ dig +noall +answer gtk-rs.org
gtk-rs.org.		3418	IN	CNAME	gtk-rs.github.io.
gtk-rs.github.io.	865	IN	A	185.199.110.153
gtk-rs.github.io.	865	IN	A	185.199.109.153
gtk-rs.github.io.	865	IN	A	185.199.108.153
gtk-rs.github.io.	865	IN	A	185.199.111.153

I think the fix is to update your DNS to match the instructions GitHub provides for configuring an apex domain. Otherwise, maybe try disabling DNSSEC. Until then, the domain is going to be dropped by DNS servers that perform DNSSEC validation.